In the tropics, most growers spend their days in a state of “crisis management.” They see wilted leaves, they see pests, they see poor fruit set—and they react. But by the time you see the damage, the plant has already lost the battle.

During our recent Webinar, our GTL Adebowale Onafowora broke down the fundamental shift every professional needs to make: moving from reactive farming to climate steering.

Key Insight: Notice how “Climate Steering” flattens the stress curve, preventing the critical damage spike that happens when you only “React to Heat.”

What is Climate Steering?

Climate steering is the intentional use of climate dynamics to control plant physiology. It’s about understanding that plants respond to leaf temperature and humidity, not just the air.

Climate steering isn’t just about cooling down a greenhouse. It is the deliberate use of environmental data to control how your plants behave. As the graph shows, reactive farming leads to unchecked stress that peaks too late, while steering keeps plant stress within a manageable, healthy range.

The 5 Levers of Climate Steering

To steer your crop effectively in a hot climate, you must master five primary levers. If you control these, you master your yield.

1. Radiation (Light & Heat)
   This controls how much raw energy enters your greenhouse.
   
   
   • The Pro Move: Use timed shading. Permanent shade blocks the light your plants need for photosynthesis during the good hours. Steer the radiation only when it becomes a threat.



2. Temperature & Humidity (The VPD Connection)
   These two levers work together to control transpiration. Temperature isn’t just a number; it is a strategy. Humidity, on the other hand, is the gas pedal of transpiration.
   
   
   • Day Temperature: This is about managing stress.
   • Night Temperature: This is the secret to your fruit set. If your nights are too hot, your yields will vanish.
   • Too High Humidity: You’ll face nutrient deficiencies and disease.
   • Too Low Humidity: Your plants will shut down from stress to save water.
   
   Master Tool: To know exactly where your greenhouse stands, use our VPD Calculator. This tool takes the guesswork out of your climate and tells you if your plants are in the Danger Zone or the Growth Zone.



3. Airflow
   Airflow is your primary tool for managing leaf temperature. Without proper air exchange, the micro-climate around the leaf becomes a heat trap, inviting pests and disease.



4. Timing (The Most Important Lever)
   In climate steering, when you act is just as important as what you do.
   
   
   • Morning: Sets the tone for the day’s growth.
   • Midday: This is about damage limitation.
   • Night: This decides tomorrow’s potential yield.

Steering vs. Reacting: The Golden Rule

The Golden Rule: You don't fight the climate; you steer plant behaviour.

If you want to see these frameworks (levers) explained in-depth with real-world examples, the full replay of our “From Guesswork to Control” session is now available. Watch the Replay on YouTube Here.

Stop being a “firefighter” and start being a Master Grower. Head over to bicfarmscollege.com to use the VPD calculator and take the first step toward a more consistent, high-yielding harvest.